Dubbed "NS4", the new concept will see Toyota return to the technology that has been its future-thinking focus in recent years: the pairing of conventional combustion engines with electric motors.

The NS4 will feature a plug-in electric vehicle powertrain - much like the upcoming Prius PHEV - utilising the same 1.8 litre petrol engine, electric motor and lithium-ion battery arrangement.

With little more than a week until its unveiling, Toyota has released a new teaser video for the NS4. There's little here in the way of details, but a few short glimpses of the concept's styling can be spotted by the eagle-eyed viewer.